diff --git a/mercurial/revlog.py b/mercurial/revlog.py
--- a/mercurial/revlog.py
+++ b/mercurial/revlog.py
@@ -1985,7 +1985,7 @@
         with self._indexfp(b'r') as ifh, self._datafp(b'w') as dfh:
             for r in self:
                 dfh.write(self._getsegmentforrevs(r, r, df=ifh)[1])
-                if troffset <= self.start(r):
+                if troffset <= self.start(r) + r * self.index.entry_size:
                     trindex = r
 
         with self._indexfp(b'w') as fp:
diff --git a/tests/test-transaction-rollback-on-revlog-split.t b/tests/test-transaction-rollback-on-revlog-split.t
--- a/tests/test-transaction-rollback-on-revlog-split.t
+++ b/tests/test-transaction-rollback-on-revlog-split.t
@@ -31,7 +31,7 @@
   $ cat .hg/store/journal | tr -s '\000' ' '
   data/file.i 1065
   data/file.d 0
-  data/file.i 0
+  data/file.i 64
   00manifest.i 111
   00changelog.i 122